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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/y-3 = 2-((7/4)*y)+12 // - 2-((7/4)*y)+12
(7/4)*y+2/y-12-3-2 = 0
7/4*y^1+2*y^-1-17*y^0 = 0
(7/4*y^2-17*y^1+2*y^0)/(y^1) = 0 // * y^2
y^1*(7/4*y^2-17*y^1+2*y^0) = 0
y^1
(7/4)*y^2-17*y+2 = 0
(7/4)*y^2-17*y+2 = 0
DELTA = (-17)^2-(2*4*(7/4))
DELTA = 275
DELTA > 0
y = (275^(1/2)+17)/(2*(7/4)) or y = (17-275^(1/2))/(2*(7/4))
y = 2/7*(5*11^(1/2)+17) or y = 2/7*(17-5*11^(1/2))
y in { 2/7*(17-5*11^(1/2)), 2/7*(5*11^(1/2)+17)}
y in { 2/7*(17-5*11^(1/2)), 2/7*(5*11^(1/2)+17) }
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